Malicious PDF — malware analysis report

Static analysis result for SHA-256 2194cd07ba2fc540…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 07:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4b715a8fa0667cf0ebe32e84540e842 SHA-1: daa752cd7bdaa7e9bb606e9b149e74a382548b6f SHA-256: 2194cd07ba2fc540390809e4c191c42831f9d9fb7ee4aa7bb569344f36b7f840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/award?keyword=excel+advanced+skills+writing+workbook+year+2+pdf
    • http://maxobujixeweden.sportsontheweb.net/kukotu.pdf
    • http://easylearning.space/krugmans_economics_for_ap_second_editionrfihp.pdf
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/8298336.pdf
    • http://hargotel.xyz/does_world_war_z_have_cross_platformtck76.pdf
    • http://liketime.fun/565617613137ntf4.pdf
    • http://neojust.ru/katakefoninajasuxufatubhvnxt.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/tujaz-sonesegununimej-miroposeb-xazaxu.pdf
    • http://sevowina.medianewsonline.com/zegerezupiwamefapuwavipu.pdf
    • http://rolapisi.scienceontheweb.net/mekoferawegolowo.pdf
    • https://segukikiregitep.weebly.com/uploads/1/3/1/8/131856439/bokamebemirod_zukoxu.pdf
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/rozumunuperexetazak.pdf
    • http://erogan24.website/368927891498z36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guvovigo/hd_video_player_apk.pdf
    • https://uploads.strikinglycdn.com/files/b640c4fa-d05d-44f5-a959-457a9e6ba38b/boguzokobunokebujoxene.pdf
    • https://s3.amazonaws.com/bugutaj/application_x-_www-_form-_urlencoded_post_json.pdf
    • https://s3.amazonaws.com/litunux/29947923162.pdf
    • https://s3.amazonaws.com/gawabog/how_do_i_read_my_kitchenaid_model_number.pdf
    • https://s3.amazonaws.com/mozedijiz/woditogakafosuxebi.pdf
    • https://s3.amazonaws.com/dusubonifu/16655130417.pdf
    • https://s3.amazonaws.com/wuxupewu/python_list_comprehension_if_or.pdf
    • https://s3.amazonaws.com/baposivarabuj/76566610243.pdf
    • https://uploads.strikinglycdn.com/files/7c9d7645-f096-441e-8524-3f1928331d89/narrative_writing_topics_grade_10.pdf
    • https://uploads.strikinglycdn.com/files/e6ac86c2-0ccf-4849-bc81-3205cd0a0770/how_much_it_cost_to_replace_samsung_tv_screen.pdf
    • https://s3.amazonaws.com/didowugorokirug/chocolaty_punjabi_song.pdf
    • https://uploads.strikinglycdn.com/files/c81a4f8d-0b6e-458a-88d1-efeb4cc7b008/51750104013.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4d.bin
eec9abb6e13c572485e47a662af0a85cd6b815e80843ff0db92be7df405ec938		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5940 bytes
font_01_sfnt_off0000f3bc.bin
715e6b3ac4c3d453f5056c72473b1dd585d04bac44e9429c0ff879496afaff6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 11048 bytes

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